I got a 99 7.3 turbo in a 99 19ft rollback. I bought the truck running rough, figuring it had a bad injector or two. Did a buzz test on all injectors and it told me that 3 of them were bad. I changed those three injectors the oil and a crank position sensor for good measure because it starts hard. It starts better now and i did a cylinder contribution test and it passed. But when i let it warm completely up it falls on its face at 2300 rpms and pushes out a big cloud of blue smoke. The check engine light is not on and passes the test my scan tool can do. when it is cold it runs rough for about a min or two and smooths out. I am not sure what i need to check next to get this to run right i have done a lot of reading and checked the fuel delivery system and carefully checked all my wires to my sensors. Does anyone have any ideas what could cause this? I did a compression test cold and all cylinders were around 420 psi cold. could the hpop be bad????

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